problems with detecting the cd in wheezy

[Kristoffer Gustafsson]

Hi.
I got a problem with installing wheezy8(testing)
Evyerhing goes well, I select my language and so, but when it shall detect the 
cd and the software on that it fails.
The message about detecting the cd just keeps jumping up and down on the screen.
what is wrong and what can I do about this?
Have any of you solved it?
/Kristoffer